In Washington, D.C., authorities have plans “to roll out a major show of police force at Reagan National Airport and Dulles International Airport, in the Washington area, which will include SWAT, bomb sniffing K9’s, and a general increased police presence, according to an aviation official,” reports CNN.

At D.C.’s Union Station and New York City’s Penn Station, police are reportedly pulling passengers aside and going through their bags before they’re allowed to board trains.

The death toll, police raids and attack details continue to evolve, along with experts’ security recommendations for major travel hubs.